G
Gregorio Chejfec
Researcher at Veterans Health Administration
Publications - 19
Citations - 3082
Gregorio Chejfec is an academic researcher from Veterans Health Administration. The author has contributed to research in topics: Hiatal hernia & Colonoscopy. The author has an hindex of 11, co-authored 19 publications receiving 3021 citations. Previous affiliations of Gregorio Chejfec include Loyola University Chicago & University of Illinois at Chicago.
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Journal ArticleDOI
Use of Colonoscopy to Screen Asymptomatic Adults for Colorectal Cancer
David A. Lieberman,David G. Weiss,John H. Bond,Dennis J. Ahnen,Harinder S. Garewal,Gregorio Chejfec +5 more
TL;DR: Colonoscopic screening can detect advanced colonic neoplasms in asymptomatic adults with or without distal neoplasia, and many of these neoplasm would not be detected with sigmoidoscopy.
Journal ArticleDOI
Five-year colon surveillance after screening colonoscopy.
David A. Lieberman,David G. Weiss,William V. Harford,Dennis J. Ahnen,Dawn Provenzale,Stephen J. Sontag,Thomas G. Schnell,Gregorio Chejfec,Donald R. Campbell,Jayashri Kidao,John H. Bond,Douglas B. Nelson,George Triadafilopoulos,Francisco C. Ramirez,Judith Collins,Tiina K. Johnston,Kenneth R. McQuaid,Harinder S. Garewal,Richard E. Sampliner,Romeo Esquivel,Douglas J. Robertson +20 more
TL;DR: There is a strong association between results of baseline screening colonoscopy and rate of serious incident lesions during 5.5 years of surveillance and patients with 1 or 2 tubular adenomas less than 10 mm represent a low-risk group compared with other patients with colon neoplasia.
Journal ArticleDOI
Hiatal hernia size, Barrett’s length, and severity of acid reflux are all risk factors for esophageal adenocarcinoma
Benjamin Avidan,Amnon Sonnenberg,Thomas G. Schnell,Gregorio Chejfec,Gregorio Chejfec,Adrienne Metz,Stephen J. Sontag +6 more
TL;DR: High-grade dysplasia and esophageal adenocarcinoma seem to stem from an extreme and unfavorable constellation of all risk factors that are generally held responsible for the development of GERD and Barrett's esophagus.
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Asthmatics with gastroesophageal reflux: long term results of a randomized trial of medical and surgical antireflux therapies.
Stephen J. Sontag,Susan O'Connell,Sharad Khandelwal,Herbert B. Greenlee,Thomas G. Schnell,Bernard A. Nemchausky,Gregorio Chejfec,Todd Miller,J. Seidel,Amnon Sonnenberg +9 more
TL;DR: In patients with both GER and asthma, antireflux surgery (but not medical therapy with ranitidine 150 mg t.i.d.) has minimal effect on pulmonary function, pulmonary medication requirements, or survival, but significantly improves asthma symptoms and overall clinical status.
Journal ArticleDOI
The importance of hiatal hernia in reflux esophagitis compared with lower esophageal sphincter pressure or smoking.
Stephen J. Sontag,Thomas G. Schnell,Todd Miller,Bernard A. Nemchausky,Rose Serlovsky,Susan O'Connell,Gregorio Chejfec,Ulla J. Seidel,Lawrence Brand +8 more
TL;DR: The presence of a hiatal hernia, not the pressure of the lower esophageal sphincter, is the most important predictor of reflux frequency, acid contact time, and esophagitis.